138-173mm ID Orion PinPoint Telescope Focusing Mask other opinie


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138-173mm ID Orion PinPoint Telescope Focusing Mask
 
 
Availability: In stock, can be sent within 24 hours

 

 
€21

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The Bahtinova mask is an unparalleled help in focusing on digital astrophotography. Focusing the image of a bright star (the clearer it is, the easier procedure is) we are sure to precisely "hit" the focal point. There is no need, as it often happens, to seek out the focus by trial and error.



• for telescopes with a tube diameter ? = 138 - 173 mm
• example application (models): Orion StarSeeker IV 130mm GoTo, SkyWatcher 130 DS, 130 Star Discovery and similar
• greatly facilitates focusing for astrophotography
• is more sensitive to defocus than digital methods (FWHM, FocusMax, Robofocus etc.)
• a universal system for attaching the mask on the tube
• made on a digital machine tool made of resistant plastic



SEE THE BAHTINOVA MASKS FOR OTHER OPTICAL OPTICAL SIZES












>> FREQUENTLY ASKED QUESTIONS <<

Question : How does the Bahtinov mask work? When do I know that the image is sharp?

Answer : We choose the brightest possible star. We preset the focus. To set the focus precisely, let's see the appearance of the star near the sharpness setting.



• on the left: the center radius unevenly distant from the outside - we are away from the focus; radius
• measure: it is better but still not perfect
• on the right: the central ray is evenly distant from the external rays - the focus is set

Question : How do you attach the mask to the telescope?

Answer : It's best to make such a frame as for a solar filter, vide: http://teleskopy.pl/filtrsloneczny.html


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